<svg xmlns="http://www.w3.org/2000/svg">
<!-- Only valid svg subdocuments (enclosed by <svg xmlns="svgNS">) are allowed in fO documents. No renderers should be created for <g> and children -->
<foreignObject width="300" height="100">
    <html xmlns="http://www.w3.org/1999/xhtml">
        <p>This should not crash</p>
        <g xmlns="http://www.w3.org/2000/svg">
            <text y="20">This should not be shown</text>
        </g>
        <g/>
    </html>
</foreignObject>
</svg>